Property, Plant and Equipment - Schedule of Major Classes (Details) - USD ($)
$ in Millions |
12 Months Ended |
Dec. 31, 2019 |
Dec. 31, 2018 |
| Public Utility, Property, Plant and Equipment [Line Items] |
|
|
| Construction work in progress |
$ 801
|
$ 593
|
| Total utility plant |
23,720
|
22,486
|
| Nonutility property |
226
|
718
|
| Less: Nonutility plant included in assets held for sale |
(5)
|
0
|
| Total property, plant and equipment |
$ 23,941
|
23,204
|
| Weighted Average Useful Life |
6 years
|
|
| Minimum |
|
|
| Public Utility, Property, Plant and Equipment [Line Items] |
|
|
| Range of Remaining Useful Lives |
3 years
|
|
| Maximum |
|
|
| Public Utility, Property, Plant and Equipment [Line Items] |
|
|
| Range of Remaining Useful Lives |
50 years
|
|
| Utility Plant |
|
|
| Public Utility, Property, Plant and Equipment [Line Items] |
|
|
| Less: Utility plant included in assets held for sale |
$ (587)
|
0
|
| Utility Plant | Land and other non-depreciable assets |
|
|
| Public Utility, Property, Plant and Equipment [Line Items] |
|
|
| Utility plant excluding Construction work in progress |
166
|
155
|
| Utility Plant | Sources of supply |
|
|
| Public Utility, Property, Plant and Equipment [Line Items] |
|
|
| Utility plant excluding Construction work in progress |
$ 858
|
821
|
| Weighted Average Useful Life |
47 years
|
|
| Utility Plant | Sources of supply | Minimum |
|
|
| Public Utility, Property, Plant and Equipment [Line Items] |
|
|
| Range of Remaining Useful Lives |
2 years
|
|
| Utility Plant | Sources of supply | Maximum |
|
|
| Public Utility, Property, Plant and Equipment [Line Items] |
|
|
| Range of Remaining Useful Lives |
127 years
|
|
| Utility Plant | Treatment and pumping facilities |
|
|
| Public Utility, Property, Plant and Equipment [Line Items] |
|
|
| Utility plant excluding Construction work in progress |
$ 3,750
|
3,607
|
| Weighted Average Useful Life |
41 years
|
|
| Utility Plant | Treatment and pumping facilities | Minimum |
|
|
| Public Utility, Property, Plant and Equipment [Line Items] |
|
|
| Range of Remaining Useful Lives |
3 years
|
|
| Utility Plant | Treatment and pumping facilities | Maximum |
|
|
| Public Utility, Property, Plant and Equipment [Line Items] |
|
|
| Range of Remaining Useful Lives |
101 years
|
|
| Utility Plant | Transmission and distribution facilities |
|
|
| Public Utility, Property, Plant and Equipment [Line Items] |
|
|
| Utility plant excluding Construction work in progress |
$ 10,807
|
10,164
|
| Weighted Average Useful Life |
70 years
|
|
| Utility Plant | Transmission and distribution facilities | Minimum |
|
|
| Public Utility, Property, Plant and Equipment [Line Items] |
|
|
| Range of Remaining Useful Lives |
9 years
|
|
| Utility Plant | Transmission and distribution facilities | Maximum |
|
|
| Public Utility, Property, Plant and Equipment [Line Items] |
|
|
| Range of Remaining Useful Lives |
149 years
|
|
| Utility Plant | Services, meters and fire hydrants |
|
|
| Public Utility, Property, Plant and Equipment [Line Items] |
|
|
| Utility plant excluding Construction work in progress |
$ 4,304
|
4,008
|
| Weighted Average Useful Life |
31 years
|
|
| Utility Plant | Services, meters and fire hydrants | Minimum |
|
|
| Public Utility, Property, Plant and Equipment [Line Items] |
|
|
| Range of Remaining Useful Lives |
5 years
|
|
| Utility Plant | Services, meters and fire hydrants | Maximum |
|
|
| Public Utility, Property, Plant and Equipment [Line Items] |
|
|
| Range of Remaining Useful Lives |
90 years
|
|
| Utility Plant | General structures and equipment |
|
|
| Public Utility, Property, Plant and Equipment [Line Items] |
|
|
| Utility plant excluding Construction work in progress |
$ 1,748
|
1,625
|
| Weighted Average Useful Life |
16 years
|
|
| Utility Plant | General structures and equipment | Minimum |
|
|
| Public Utility, Property, Plant and Equipment [Line Items] |
|
|
| Range of Remaining Useful Lives |
1 year
|
|
| Utility Plant | General structures and equipment | Maximum |
|
|
| Public Utility, Property, Plant and Equipment [Line Items] |
|
|
| Range of Remaining Useful Lives |
109 years
|
|
| Utility Plant | Waste collection |
|
|
| Public Utility, Property, Plant and Equipment [Line Items] |
|
|
| Utility plant excluding Construction work in progress |
$ 1,153
|
943
|
| Weighted Average Useful Life |
59 years
|
|
| Utility Plant | Waste collection | Minimum |
|
|
| Public Utility, Property, Plant and Equipment [Line Items] |
|
|
| Range of Remaining Useful Lives |
5 years
|
|
| Utility Plant | Waste collection | Maximum |
|
|
| Public Utility, Property, Plant and Equipment [Line Items] |
|
|
| Range of Remaining Useful Lives |
114 years
|
|
| Utility Plant | Waste treatment, pumping and disposal |
|
|
| Public Utility, Property, Plant and Equipment [Line Items] |
|
|
| Utility plant excluding Construction work in progress |
$ 720
|
$ 570
|
| Weighted Average Useful Life |
45 years
|
|
| Utility Plant | Waste treatment, pumping and disposal | Minimum |
|
|
| Public Utility, Property, Plant and Equipment [Line Items] |
|
|
| Range of Remaining Useful Lives |
3 years
|
|
| Utility Plant | Waste treatment, pumping and disposal | Maximum |
|
|
| Public Utility, Property, Plant and Equipment [Line Items] |
|
|
| Range of Remaining Useful Lives |
139 years
|
|